# physical meaning of dark matter virial radius

As I have read in the literature, the virial radius of a dark matter halo is the radius of a sphere such that the density $\frac{M_{\text{virial}}}{\frac{4\pi}{3}R_{\text{virial}}^{3}}=97.2\rho_{\text{crit}},$ where $\rho_{\text{crit}}$ is the critical density of the Universe.

Does it mean that the dark matter halo has a finite extension given by $R_{\text{vir}}$?

Does it mean that outside this virial radius there's not dark matter anymore?

The factor of $97.2$ in that equation however is arbitrary. It can range from anywhere between $50-200$.